[PATCH] D87586: [X86] Improve nnan fmin/fmax vector reduction

[Nikita Popov via Phabricator via llvm-commits]

nikic created this revision.
nikic added reviewers: spatel, RKSimon, craig.topper.
Herald added subscribers: llvm-commits, hiraditya.
Herald added a project: LLVM.
nikic requested review of this revision.

Use +/-Inf as neutral element for nnan fmin/fmax reductions. Using NaN requires dropping the nnan flag, which is important to get a good lowering on X86.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D87586

Files:
  llvm/lib/CodeGen/SelectionDAG/LegalizeVectorTypes.cpp
  llvm/test/CodeGen/AArch64/vecreduce-fmax-legalization.ll
  llvm/test/CodeGen/X86/vector-reduce-fmax-nnan.ll
  llvm/test/CodeGen/X86/vector-reduce-fmin-nnan.ll

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